Questions tagged [vectorization]
The conversion of raster data (an array of cell values) to vector data (a series of points, lines, and polygons).
191 questions
3 votes
2 answers
78 views
Vectorize multiband raster to points/polygons with multiple values
When vectorizing rasters with the "Raster pixels to points" tool, I have to choose a single band (there is no option to say: All bands). I.e. when vectorizing multiple raster bands, I have ...
- 2,788
5 votes
1 answer
198 views
Skeletonize or extract lines from segmentation image
I have this raster: which I'd like to convert to vector data (linestring) (e.g. a Shapefile). To this end, I'm using this Python code: import rasterio import geopandas as gpd from skimage.morphology ...
- 11.4k
0 votes
0 answers
57 views
Alternative (parametrization) to Voronoi Skeleton for vectorizing roads in a raster to lines?
I am using GRASS Voronoi Skeleton (v.voronoi.skeleton) in QGIS, to create lines from what are "road polygons". It works well enough in cases of straight, disjunctive polygons. Problem are ...
- 2,788
0 votes
1 answer
78 views
Perimeter shapefile around raster cells above a certain value - water body mapping
I am using QGIS to map water bodies from satellite-based spectral data which is provided in raster formats. This is to understand how these water body shapes and areas change over time between each ...
- 1
0 votes
0 answers
56 views
Way to package an ArcGIS Pro project that contains a raster-to-polygon layer
I have FEMA 1% raster data, that I converted to polygon using raster-to-polygon tool. Esri is blocking me to package the project because I used that tool. I even deleted all the FEMA layers and still ...
2 votes
1 answer
77 views
vectorize land-use classes drawn as patterns in raster
I have a scanned map (raster) with land-use classes drawn as patterns. Which QGIS-tool or python tool would be good to, for example, create a shapefile with points at, or a box around, each of the *-...
- 23
2 votes
1 answer
312 views
Classify a multi-band raster image into discrete categories
I have a PNG of a map, which uses RGB colours. It has about 6 colours that it uses in the map, which are fully discrete. Here is a small snippet from the map: I want to generate something like a ...
- 121
2 votes
1 answer
171 views
Raster to polygon in QGIS - How to Poligonize using a limit of vertices
In ArcGIS, when I use the Raster to Polygon tool, I can set the Maximum vertices per polygon feature parameter, where the algorithm subdivides a polygon into smaller polygons. For example: The result ...
2 votes
1 answer
95 views
Geopandas slow after vectorization
Processed an NDVI, created classes from it and vectorized the file. The area is about 4 km * 4 km. I wanted to intersect, and that was slow. While creating a minimal example, it seems like any geo-...
- 561
0 votes
1 answer
637 views
Convert a PNG file to a line layer in QGIS
I have a map in PNG-format that looks like this: I have imported it into QGIS as a raster. I want to create a line layer as a network based on the blue and pink lines. Is there a way to create a line ...
- 85
0 votes
2 answers
218 views
Converting vectorization (raster to vector) with small steps in values in QGIS
I have a raster file that contains water depths in m. The water depths are the only attribute and should be transferred to the vector layer. The raster files have a cell accuracy of 1m x 1m. I would ...
- 19
0 votes
0 answers
61 views
Extract a vector from a raster with a single boundary in QGIS
I have a "problem", I need transform a raster in a vector and it works but some pixels like the one in the print it is separated from the boundary, and for my use (a specific use of ...
- 123
0 votes
1 answer
259 views
ReducetoVectors in Google Earth Engine not working with the Mollweide transformation. Need to calculate zonal statistics for global scale analysis
My study is a global-scale analysis of the factors driving forest gain, with grid cells as the unit of analysis. I need to calculate the amount of forest gain per ~65km2 hexagonal grid cell at the ...
1 vote
1 answer
93 views
Generate points from raster image in QGIS
I'm hoping to generate a new vector file from select points from a raster image in QGIS. I don't know if it is possible. For instance, I would like to generate a vector point file that puts a point ...
0 votes
0 answers
101 views
Convert topographic map to vector and text
I have a topographic map in TIFF format and I vectorized it in QGIS (3.22.0). For my project I needed the settlements, which I was able to extract. More importantly are the names of the settlement. ...
- 587